I'm no expert (especially on RT-7's), by any means, but if the task at hand is replacement of a switch, there usually is no re-alignment needed. The switch originally was supposed to be a zero ohm or infinity ohm situation, and so should a working used or a new switch. The only case where re-alignment might be needed is if the old switch was somehow inducing resistance into a circuit and some previous technician tried to adjust to compensate for it. I would replace the switch and give it a try - it will probably work fine.

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